usher and eneisser inn 1964 conductd a study and picked people who had one of the following experinces
birth of a sibiling
death of a family member
moving to a new home
they only picked people who had gone through these experiences at ages 1-5 however family stories and photos may have helped them remember so are they actually memories
so they were then asked if they had any of the following to help remember the events
family stories
photos
movies
200/222 had at least one
early memories are measured using target recall
multistore memory systems are the reason why childhood amnesisa occurs